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# There are known knowns; there are things we know that we know.
There are known unknowns; that is to say, there are things that we now know we don't know.
But there are also unknown unknowns – there are things we do not know we don't know.
(, Mon 30 Sep 2013, 17:50, archived)
# Which makes perfect sense to me.
I have never really understood why anyone was confused by it.
(, Mon 30 Sep 2013, 18:13, archived)
# Me too.
But it still makes me smile :-)
(, Mon 30 Sep 2013, 18:27, archived)